Fixed bed desulfurization system

Abstract

The utility model discloses a fixed bed desulfurization system. The system at least comprises a fixed bed desulfurization system and a flue gas switching system, the fixed bed desulfurization system comprises a desulfurization tower, and two desulfurizer filling pipes are arranged in the desulfurization tower side by side; the desulfurizing tower is divided into three cavities by the two desulfurizing agent filling pipes; a partition plate is horizontally arranged in a middle cavity between the two desulfurizing agent filling pipes; an upper communication port and a lower communication port are formed in the wall of the desulfurizing tower corresponding to the upper middle cavity and the lower middle cavity; the two communicating ports are respectively positioned on two opposite sides of the desulfurizing tower; the flue gas switching system comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve and an annular flue; according to the utility model, the fixed bed desulfurization uniform feeding and discharging functions can be realized; the purpose of switching the inlet and outlet of the fixed bed desulfurization tower to ensure full and uniform utilization of upper and lower desulfurizers of the desulfurization tower bed can be achieved, the frequency of replacing the fixed bed desulfurizers is reduced, and the function of replacing the desulfurizers on line can also be achieved.

Description

Technical Field

[0001] This utility model relates to a fixed-bed desulfurization system. Background Technology

[0002] Fixed-bed desulfurization technology is perfectly suited for applications with small flue gas volumes and low sulfur concentrations, making it particularly suitable for gas-fired power generation systems, steel rolling furnaces, and hot blast stoves in the steel industry. This technology offers several advantages: ① Low temperature reduction, resulting in dry flue gas after desulfurization, eliminating the need for corrosion protection and producing no "white smoke"; ② Recyclable desulfurization byproducts, preventing secondary pollution; ③ Simple system, requiring no operator intervention, and easy to inspect and maintain; ④ No secondary dust generation, eliminating the need for additional dust removal equipment; ⑤ Low overall system resistance and low energy consumption. However, it also presents challenges such as the need for regular desulfurization agent replacement, rapid desulfurization on the first contact side of the flue gas compared to the later contact side, leading to frequent agent replacements and uneven material distribution during replacement. Therefore, a system to address these issues is urgently needed. Utility Model Content

[0003] To overcome the above-mentioned defects, the purpose of this utility model is to provide a fixed bed desulfurization system.

[0004] To achieve the above objectives, the fixed-bed desulfurization system of this utility model includes at least a fixed-bed desulfurization system and a flue gas switching system;

[0005] The fixed-bed desulfurization system includes a desulfurization tower, within which two desulfurizing agent filling pipes are arranged side-by-side. These two pipes divide the desulfurization tower into three chambers. A partition is horizontally arranged in the intermediate chamber between the two pipes, dividing it into an upper intermediate chamber and a lower intermediate chamber. Upper and lower connecting ports are provided on the walls of the desulfurization tower corresponding to the upper and lower intermediate chambers, respectively. These two connecting ports are located on opposite sides of the desulfurization tower.

[0006] The flue gas switching system includes a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, and an annular flue. A flue gas inlet is located on one side of the annular flue, and a flue gas outlet is located on the opposite side. The annular flue is located outside the desulfurization tower and connects to two connecting ports. The first and second switching valves are located within the annular flue on both sides of the upper connecting port; the third and fourth switching valves are located within the annular flue on both sides of the lower connecting port.

[0007] When the second and third switching valves are open and the first and fourth switching valves are closed, the flue gas being treated enters the desulfurization tower through the third switching valve and the lower connecting port, and then enters the left and right chambers through the two desulfurizing agent filling pipes on both sides of the lower intermediate chamber, and is further discharged through the two desulfurizing agent filling pipes, the upper connecting port and the second switching valve in the upper intermediate chamber; thus realizing the function of lower inlet and upper outlet.

[0008] When the second and third switching valves are closed and the first and fourth switching valves are open, the flue gas being treated enters the desulfurization tower through the first switching valve and the upper connecting port, and then enters the left and right chambers through the two desulfurizing agent filling pipes on both sides of the upper intermediate chamber, and is further discharged through the two desulfurizing agent filling pipes, the lower connecting port and the fourth switching valve in the lower intermediate chamber; thus realizing the function of upper inlet and lower outlet.

[0009] Furthermore, a feeding system is provided on the fixed bed desulfurization system; the feeding system includes, from top to bottom, a loading bin, a discharge valve, a distribution bin, and a feeding long shaft discharger;

[0010] The upper part of the feeding system's distribution hopper is connected to the loading hopper via a discharge valve. The distribution hopper is a central feeding hopper, and the material is evenly divided into two parts by a human-shaped distribution plate. The lower part of the distribution hopper is connected to the two desulfurizing agent filling pipes of the fixed bed desulfurization tower via a feeding long shaft discharger.

[0011] Furthermore, a discharge system is provided below the fixed-bed desulfurization system, and the discharge system includes, from top to bottom, a discharge long-shaft unloader, a discharge hopper, and a discharge valve; wherein,

[0012] The fixed-bed desulfurization tower achieves uniform discharge of desulfurizing agent to the discharge hopper through the discharge long shaft unloader, and finally discharges the ineffective desulfurizing agent to the outside of the tower through the discharge valve.

[0013] Furthermore, the discharge width of the feeding long shaft unloader is consistent with the width of the desulfurizing agent bed in the fixed bed desulfurization tower.

[0014] Furthermore, the discharge width of the discharge long shaft unloader is consistent with the width of the desulfurizing agent bed in the fixed bed desulfurization tower.

[0015] Furthermore, the discharge valve is a star-shaped discharge valve.

[0016] Furthermore, the discharge valve is a star-shaped discharge valve.

[0017] Furthermore, an induced draft fan is installed at the flue gas outlet of the annular flue.

[0018] With the above structure, this utility model can achieve uniform feeding and unloading of fixed bed desulfurization; it can achieve the purpose of switching between the inlet and outlet of the fixed bed desulfurization tower to ensure that the desulfurizing agent in the upper and lower layers of the desulfurization tower is fully and uniformly utilized, reduce the frequency of replacing the fixed bed desulfurizing agent, and can also achieve the function of online replacement of desulfurizing agent. Attached Figure Description

[0019] Figure 1 This is a schematic elevation view of the system with a lower air inlet and an upper air outlet.

[0020] Figure 2 This is a schematic diagram of the lower air inlet and upper air outlet mode of the system of this utility model;

[0021] Figure 3 This is a schematic elevation view of the system with an upper air inlet and a lower air outlet.

[0022] Figure 4 This is a schematic diagram of the system with an upper air inlet and a lower air outlet.

[0023] 1. Feeding bin; 2. Discharge valve; 3. Distribution bin; 4. Feeding long shaft discharge; 5. Desulfurization tower; 5-1. Desulfurization tower inlet and outlet chamber baffle; 6. Desulfurizing agent filling layer; 7. Long shaft discharger; 8. Discharge bin; 9. Discharge valve; 10. Exhaust fan; 11-1. Switching valve 1; 11-2. Switching valve 2; 11-3. Switching valve 3; 11-4. Switching valve 4. Detailed Implementation

[0024] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] like Figure 1 As shown, the fixed-bed desulfurization tower system has a rectangular structure. The flue gas follows a U-shaped path within the tower. The inlet and outlet chambers are arranged vertically and are both located in the middle of the tower, separated by a partition (5-1). In this mode, switching valves (11-2) and (11-3) are open, while switching valves (11-1) and (11-4) are closed. The fixed-bed desulfurization system uses a bottom inlet and top outlet configuration. The fixed-bed operating space velocity should not exceed 500 h⁻¹; the flue gas velocity in the empty tower should be controlled at 0.35 m / s; and the system resistance should not exceed 1.5 kPa. During operation, the inlet and outlet modes of the fixed-bed desulfurization tower system can be switched periodically, such as... Figure 3 As shown, switching valves (11-2) and (11-3) are in the closed state, while switching valves (11-1) and (11-4) are in the open state. The fixed-bed desulfurization system changes to an upper inlet and lower outlet mode. After the above mode change, the windward side of the desulfurizing agent in the original mode becomes the leeward side, and the leeward side of the desulfurizing agent in the original mode becomes the windward side. In the original mode, the lower part of the baffle (5-1) contacts the flue gas first, while in the new mode, the upper part of the baffle (5-1) contacts the flue gas first. This achieves uniform contact between the fixed-bed desulfurizing agent and the flue gas from front to back and top to bottom, enabling synchronous reaction and deactivation.

[0028] Compared with the fixed bed desulfurization system, the long-shaft feeding and long-shaft unloading mode is adopted to achieve uniformity of feeding and unloading in the bed cross section. And through the cooperation of the unloading valve (2) with the discharge valve (9), the long-shaft unloader (4) and the discharge long-shaft unloader (7), a double-layer sealing guarantee is achieved on the feeding side and the discharge side of the fixed bed desulfurization tower.

[0029] When replacing the desulfurizing agent, the charging hopper (1) and the distributing hopper (3) can be filled first, and new material can be added in time during the feeding process. The discharge long shaft unloader (7) can be opened for unloading. By the weight of the desulfurizing agent, the function of discharging and feeding at the same time can be realized. Since the width of the feeding long shaft unloader (4) and the discharge long shaft unloader (7) is consistent with the width of the desulfurizing agent bed in the fixed bed desulfurization tower, it can ensure that the deactivated desulfurizing agent bed is uniformly discharged and the new material is uniformly added, without the need to stop the machine for filling.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0032] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A fixed-bed desulfurization system, characterized in that: It should include at least a fixed-bed desulfurization system and a flue gas switching system; The fixed-bed desulfurization system includes a desulfurization tower, in which two desulfurizing agent filling pipes are arranged side by side; the two desulfurizing agent filling pipes divide the desulfurization tower into three chambers. A partition is horizontally installed in the intermediate cavity between the two desulfurizing agent filling pipes, which divides the intermediate cavity into an upper intermediate cavity and a lower intermediate cavity; an upper connecting port and a lower connecting port are provided on the desulfurization tower wall corresponding to the upper intermediate cavity and the lower intermediate cavity; the two connecting ports are located on opposite sides of the desulfurization tower. The flue gas switching system includes a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, and an annular flue. A flue gas inlet is located on one side of the annular flue, and a flue gas outlet is located on the opposite side. The annular flue is located outside the desulfurization tower and connects to two connecting ports. The first and second switching valves are located within the annular flue on both sides of the upper connecting port; the third and fourth switching valves are located within the annular flue on both sides of the lower connecting port. When the second and third switching valves are open and the first and fourth switching valves are closed, the flue gas being treated enters the desulfurization tower through the third switching valve and the lower connecting port, and then enters the left and right chambers through the two desulfurizing agent filling pipes on both sides of the lower intermediate chamber, and is further discharged through the two desulfurizing agent filling pipes, the upper connecting port and the second switching valve in the upper intermediate chamber; thus realizing the function of lower inlet and upper outlet. When the second and third switching valves are closed and the first and fourth switching valves are open, the flue gas being treated enters the desulfurization tower through the first switching valve and the upper connecting port, and then enters the left and right chambers through the two desulfurizing agent filling pipes on both sides of the upper intermediate chamber, and is further discharged through the two desulfurizing agent filling pipes, the lower connecting port and the fourth switching valve in the lower intermediate chamber; thus realizing the function of upper inlet and lower outlet.

2. The fixed-bed desulfurization system as described in claim 1, characterized in that: A feeding system is provided on the fixed bed desulfurization system; the feeding system includes, from top to bottom, a loading bin, a discharge valve, a distribution bin, and a feeding long shaft discharger; The upper part of the feeding system's distribution hopper is connected to the loading hopper via a discharge valve. The distribution hopper is a central feeding hopper, and the material is evenly divided into two parts by a human-shaped distribution plate. The lower part of the distribution hopper is connected to the two desulfurizing agent filling pipes of the fixed bed desulfurization tower via a feeding long shaft discharger.

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